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SpringerOpen, The European Physical Journal C, 8(77), 2017

DOI: 10.1140/epjc/s10052-017-5061-9

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Fiducial, total and differential cross-section measurements of $t$-channel single top-quark production in $pp$ collisions at 8 TeV using data collected by the ATLAS detector

Journal article published in 2017 by Morad Aaboud, Georges Aad ORCID, Brad Abbott, Jalal Abdallah, Ovsat Abdinov, Baptiste Abeloos, Ossama S. AbouZeid, Nicola L. Abraham, Halina Abramowicz, Henso Abreu, Ricardo Abreu, Yiming Abulaiti, Bobby Samir Acharya, Shunsuke Adachi, Leszek Adamczyk and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

See paper for full list of authors - 70 pages in total, author list starting on page 54, 22 figures, 21 tables, submitted to Eur. Phys. J. C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-05/ ; Detailed measurements of $t$-channel single top-quark production are presented. They use 20.2 fb$^{-1}$ of data collected by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of 8 TeV at the LHC. Total, fiducial and differential cross-sections are measured for both top-quark and top-antiquark production. The fiducial cross-section is measured with a precision of 5.8 % (top quark) and 7.8 % (top antiquark), respectively. The total cross-sections are measured to be $σ_{\mathrm{tot}}(tq) = 56.7^{+4.3}_{-3.8}\;$pb for top-quark production and $σ_{\mathrm{tot}}(\bar{t}q) = 32.9^{+3.0}_{-2.7}\;$pb for top-antiquark production. In addition, the ratio of top-quark to top-antiquark production cross-sections is determined to be $R_t=1.72 ± 0.09$, with an improved relative precision of 4.9 % since several systematic uncertainties cancel in the ratio. The differential cross-sections as a function of the transverse momentum and rapidity of both the top quark and the top antiquark are measured at both the parton and particle levels. The transverse momentum and rapidity differential cross-sections of the accompanying jet from the $t$-channel scattering are measured at particle level. All measurements are compared to various Monte Carlo predictions as well as to fixed-order QCD calculations where available.